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首页> 外文期刊>RSC Advances >Pd–ZnO nanowire arrays as recyclable catalysts for 4-nitrophenol reduction and Suzuki coupling reactions
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Pd–ZnO nanowire arrays as recyclable catalysts for 4-nitrophenol reduction and Suzuki coupling reactions

机译：Pd–ZnO纳米线阵列作为4-硝基苯酚还原和Suzuki偶联反应的可回收催化剂

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摘要

In this work, we report a facile approach for the preparation of Pd nanoparticle–ZnO nanowire arrays followed by demonstrating their use as recyclable catalyst for reactions under different conditions. The facile synthesis largely relies on a spontaneous reduction of PdCl42? at the surface of oriented ZnO nanowires grown on a Zn foil. This is due to a combination of the strongly reducing ability of Zn foil and the semiconducting nature of ZnO nanowires. At room temperature and under a weak alkaline condition, the as-prepared Pd nanoparticle–ZnO nanowire arrays show a catalytic activity factor up to 76.6 s?1 g?1 in the reduction of 4-nitrophenol and no obvious decreases in the catalytic activity even after use of 10 times. Meanwhile, the as-prepared Pd nanoparticle–ZnO nanowire arrays exhibit extraordinary catalytic activity toward Suzuki and carbonylative Suzuki reactions at a higher temperature under a stronger alkaline condition. The outstanding performance of the hybrid nanowire arrays is mainly originated from the small size of the Pd nanoparticles (～2–4 nm) with clean surfaces, as well as a strong affinity between the Pd nanoparticles and ZnO nanowires, leading to marginable catalyst loss and aggregation. Considering the multiple choices of both noble metal nanocatalyst and transition metal oxide nanowire array, we expect noble metal nanoparticle-transition metal oxide nanowire arrays to be emerged as a new class of recyclable catalysts attractive for diverse organic reactions to develop pharmaceuticals, natural products and advanced functional materials.
机译：在这项工作中，我们报告了一种制备Pd纳米颗粒-ZnO纳米线阵列的简便方法，然后证明了它们可作为在不同条件下反应的可循环催化剂。容易的合成很大程度上取决于在生长的取向ZnO纳米线表面上PdCl 4 2？ 的自发还原在锌箔上。这是由于Zn箔的强还原能力和ZnO纳米线的半导体性质的结合。在室温和弱碱性条件下，制备的Pd纳米颗粒-ZnO纳米线阵列显示出高达76.6 s ？1 g < sup>？1 在4-硝基苯酚的还原反应中，即使使用10次，催化活性也没有明显降低。同时，所制备的Pd纳米颗粒-ZnO纳米线阵列在较高的温度和更强的碱性条件下对铃木和羰基铃木反应表现出非凡的催化活性。杂化纳米线阵列的出色性能主要源于具有清洁表面的Pd纳米粒子的小尺寸（约2-4 nm），以及Pd纳米粒子与ZnO纳米线之间的强亲和力，导致可观的催化剂损失和聚合。考虑到贵金属纳米催化剂和过渡金属氧化物纳米线阵列的多种选择，我们预计贵金属纳米颗粒-过渡金属氧化物纳米线阵列将作为一类新型的可回收催化剂出现，对各种有机反应具有吸引力，以开发药物，天然产物和先进技术。功能材料。

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